diff --git a/packages/app/src/app/create/page.tsx b/packages/app/src/app/create/page.tsx
index 3561ba1..70b0f7f 100644
--- a/packages/app/src/app/create/page.tsx
+++ b/packages/app/src/app/create/page.tsx
@@ -122,6 +122,8 @@ function CreateLockInner() {
     usdcDecimals,
     treasury,
     explorerUrl,
+    explorerName,
+    usdcNote,
   } = useMemo(
     () =>
       getChainConfig(
@@ -474,7 +476,7 @@ function CreateLockInner() {
       lockInFlightRef.current = false;
       setStep("success");
       toast("Lock created!", "success", {
-        label: "View on BaseScan",
+        label: `View on ${explorerName}`,
         href: `${explorerUrl}/tx/${lockTxHash}`,
       });
       trackLockCreated({
@@ -511,6 +513,7 @@ function CreateLockInner() {
     chainId,
     sablierLockup,
     explorerUrl,
+    explorerName,
     usdcDecimals,
   ]);
 
@@ -616,6 +619,7 @@ function CreateLockInner() {
               usdcDecimals={usdcDecimals}
               sablierAddress={sablierLockup}
               explorerUrl={explorerUrl}
+              explorerName={explorerName}
               onCreateAnother={resetForm}
             />
           ) : (
@@ -708,6 +712,11 @@ function CreateLockInner() {
                       {formatUnits(totalAmount, usdcDecimals)} USDC (incl. {brokerFeePct} fee).
                     </p>
                   )}
+                  {usdcNote && (
+                    <p className="text-[11px] text-faint leading-relaxed">
+                      {usdcNote}
+                    </p>
+                  )}
                   {IS_TESTNET && isConnected && (
                     <button
                       onClick={() =>
@@ -978,7 +987,7 @@ function CreateLockInner() {
                           rel="noopener noreferrer"
                           className="inline-flex items-center min-h-[2.75rem] px-2 text-sm text-faint hover:text-cyan underline transition-colors"
                         >
-                          View on BaseScan
+                          View on {explorerName}
                         </a>
                       )}
                     </div>
@@ -1023,7 +1032,7 @@ function CreateLockInner() {
                           rel="noopener noreferrer"
                           className="inline-flex items-center min-h-[2.75rem] px-2 text-sm text-faint hover:text-cyan underline transition-colors"
                         >
-                          View on BaseScan
+                          View on {explorerName}
                         </a>
                       )}
                     </div>
@@ -1389,6 +1398,7 @@ function SuccessView({
   usdcDecimals,
   sablierAddress,
   explorerUrl,
+  explorerName,
   onCreateAnother,
 }: {
   txHash: `0x${string}`;
@@ -1398,6 +1408,7 @@ function SuccessView({
   usdcDecimals: number;
   sablierAddress: Address;
   explorerUrl: string;
+  explorerName: string;
   onCreateAnother: () => void;
 }) {
   const now = Math.floor(Date.now() / 1000);
@@ -1492,7 +1503,7 @@ function SuccessView({
           rel="noopener noreferrer"
           className="block text-xs text-faint hover:text-cyan underline transition-colors text-center"
         >
-          View transaction on BaseScan
+          View transaction on {explorerName}
         </a>
       </div>
     </div>
diff --git a/packages/app/src/app/page.tsx b/packages/app/src/app/page.tsx
index 066b9b5..3372749 100644
--- a/packages/app/src/app/page.tsx
+++ b/packages/app/src/app/page.tsx
@@ -78,7 +78,7 @@ const TRUST_POINTS = [
   {
     eyebrow: "04",
     title: "Site goes down. You're fine.",
-    body: "Your lock lives in Sablier, not on our servers. Interact directly via BaseScan anytime. RipGuard disappearing tomorrow doesn't touch your funds.",
+    body: "Your lock lives in Sablier, not on our servers. Interact directly via your chain's block explorer anytime. RipGuard disappearing tomorrow doesn't touch your funds.",
   },
 ];
 
@@ -122,7 +122,7 @@ export default function Home() {
   const chainId = useChainId();
   // Unconnected users + users on unsupported chains see the default chain's
   // contract link so the landing always has somewhere real to point at.
-  const { sablierLockup, explorerUrl } = getChainConfig(
+  const { sablierLockup, explorerUrl, explorerName } = getChainConfig(
     isSupportedDeploymentChain(chainId, IS_TESTNET) ? chainId : DEFAULT_CHAIN_ID,
   );
   const sablierExplorerUrl = `${explorerUrl}/address/${sablierLockup}`;
@@ -457,7 +457,7 @@ export default function Home() {
                       >
                         Sablier Lockup contract
                       </a>{" "}
-                      on BaseScan. Verified, immutable, no proxy.
+                      on the chain&apos;s block explorer. Verified, immutable, no proxy.
                     </span>
                   </li>
                   <li className="flex gap-4">
@@ -622,7 +622,7 @@ export default function Home() {
                 </p>
                 <p className="text-faint">
                   All smart contracts carry risk. Start with $5. Verify the
-                  Sablier contract yourself on BaseScan.
+                  Sablier contract yourself on the chain&apos;s block explorer.
                 </p>
               </FAQItem>
 
@@ -640,7 +640,7 @@ export default function Home() {
                 <p>
                   Your lock lives in Sablier, not on our servers. If this site
                   goes down tomorrow, your vault keeps counting down and you can
-                  claim directly through BaseScan or the Sablier app.
+                  claim directly through the chain&apos;s block explorer or the Sablier app.
                 </p>
                 <p className="text-foreground">
                   RipGuard is the UI. Sablier is the bank.
@@ -745,13 +745,13 @@ export default function Home() {
                 rel="noopener noreferrer"
                 className="inline-flex items-center min-h-[2.75rem] px-3 hover:text-cyan transition-colors"
               >
-                BaseScan
+                {explorerName}
               </a>
             </nav>
           </div>
           <p className="mt-10 text-xs text-faint max-w-2xl mx-auto text-center leading-relaxed">
             RipGuard does not custody funds. All locks are created directly in
-            Sablier&apos;s audited protocol on Base. Non-custodial. Immutable. Not
+            Sablier&apos;s audited protocol. Non-custodial. Immutable. Not
             financial advice. DYOR. 0.5% broker fee collected via Sablier&apos;s
             native mechanism.
           </p>
diff --git a/packages/app/src/app/vaults/page.tsx b/packages/app/src/app/vaults/page.tsx
index 33ba86f..24bb133 100644
--- a/packages/app/src/app/vaults/page.tsx
+++ b/packages/app/src/app/vaults/page.tsx
@@ -428,7 +428,7 @@ function VaultDashboard() {
   const chainConfig = getChainConfig(
     isSupportedDeploymentChain(chainId, IS_TESTNET) ? chainId : DEFAULT_CHAIN_ID,
   );
-  const { sablierLockup, usdcDecimals, explorerUrl } = chainConfig;
+  const { sablierLockup, usdcDecimals, explorerUrl, explorerName } = chainConfig;
   const publicClient = usePublicClient();
   const { toast } = useToast();
 
@@ -589,11 +589,11 @@ function VaultDashboard() {
       setClaimingId(null);
       refetchStreams();
       toast("Claim successful!", "success", {
-        label: "View on BaseScan",
+        label: `View on ${explorerName}`,
         href: `${explorerUrl}/tx/${withdrawTxHash}`,
       });
     }
-  }, [isWithdrawConfirmed, withdrawTxHash, claimingId, refetchStreams, toast, explorerUrl]);
+  }, [isWithdrawConfirmed, withdrawTxHash, claimingId, refetchStreams, toast, explorerUrl, explorerName]);
 
   // Toast + reset claiming state if tx rejected or failed
   useEffect(() => {
@@ -709,6 +709,11 @@ function VaultDashboard() {
 
   return (
     <div className="flex-1 w-full max-w-4xl mx-auto px-5 sm:px-8 pb-24 space-y-10">
+      {chainConfig.usdcNote && (
+        <p className="text-[11px] text-faint leading-relaxed pt-1">
+          {chainConfig.usdcNote}
+        </p>
+      )}
       {totals && (
         <div className="border-y border-line py-7">
           <ul className="flex flex-wrap items-baseline gap-x-10 gap-y-5">
diff --git a/packages/app/src/config/chains.test.ts b/packages/app/src/config/chains.test.ts
index 23563ae..414ddd3 100644
--- a/packages/app/src/config/chains.test.ts
+++ b/packages/app/src/config/chains.test.ts
@@ -25,7 +25,7 @@ describe("chain registry", () => {
   });
 
   it("throws on unsupported chainId", () => {
-    expect(() => getChainConfig(1)).toThrow(/Unsupported chainId: 1/);
+    expect(() => getChainConfig(999_999)).toThrow(/Unsupported chainId: 999999/);
   });
 
   it("DEFAULT_CHAIN_ID resolves to a registered chain", () => {
@@ -55,7 +55,8 @@ describe("chain registry", () => {
   it("isSupportedChain recognizes registered chains", () => {
     expect(isSupportedChain(8453)).toBe(true);
     expect(isSupportedChain(84532)).toBe(true);
-    expect(isSupportedChain(1)).toBe(false);
+    expect(isSupportedChain(1)).toBe(true);
+    expect(isSupportedChain(999_999)).toBe(false);
     expect(isSupportedChain(undefined)).toBe(false);
   });
 
@@ -71,4 +72,34 @@ describe("chain registry", () => {
     expect(isSupportedDeploymentChain(999_999, true)).toBe(false);
     expect(isSupportedDeploymentChain(undefined, false)).toBe(false);
   });
+
+  it("BNB Chain uses 18-decimal Binance-Peg USDC", () => {
+    const bsc = getChainConfig(56);
+    expect(bsc.usdcDecimals, "BNB Chain USDC is 18 decimals, not 6").toBe(18);
+    expect(bsc.usdc).toBe("0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d");
+    expect(bsc.usdcNote, "BNB Chain entry must disclose Binance-Peg variant").toMatch(
+      /Binance-Peg/i
+    );
+  });
+
+  it("every other registered chain uses 6-decimal USDC", () => {
+    for (const chain of Object.values(CHAINS)) {
+      if (chain.chainId === 56) continue; // BNB is the documented exception
+      expect(chain.usdcDecimals, `${chain.name} expected 6 decimals`).toBe(6);
+    }
+  });
+
+  it("all mainnet chains share the same treasury EOA", () => {
+    const mainnetChains = Object.values(CHAINS).filter((c) => !c.isTestnet);
+    const treasuries = new Set(mainnetChains.map((c) => c.treasury.toLowerCase()));
+    expect(treasuries.size, "treasury must be the same address on every mainnet chain").toBe(1);
+  });
+
+  it("all 7 target EVM mainnet chains are present", () => {
+    // Base, Ethereum, Arbitrum, Optimism, Polygon, Avalanche, BNB Chain
+    const expected = [1, 10, 56, 137, 8453, 42161, 43114];
+    for (const id of expected) {
+      expect(isSupportedChain(id), `chainId ${id} must be in the registry`).toBe(true);
+    }
+  });
 });
diff --git a/packages/app/src/config/chains.ts b/packages/app/src/config/chains.ts
index 1753947..aff8833 100644
--- a/packages/app/src/config/chains.ts
+++ b/packages/app/src/config/chains.ts
@@ -9,13 +9,41 @@ export type ChainConfig = {
   usdcDecimals: number;
   treasury: Address;
   explorerUrl: string;
+  // Brand name of the explorer at explorerUrl, used as link/button copy.
+  // "View on BaseScan" reads stronger than a generic "View on the explorer"
+  // and is correct per chain (Etherscan, Arbiscan, etc.).
+  explorerName: string;
   streamStartBlock: bigint;
   logChunkSize: bigint;
   isTestnet: boolean;
+  // Optional disclosure shown in /create and /vaults when this chain is
+  // active. Used today to flag that BNB Chain "USDC" is Binance-Peg, not
+  // Circle-native — a real distinction users should know about.
+  usdcNote?: string;
 };
 
 export const ZERO_ADDRESS: Address = "0x0000000000000000000000000000000000000000";
 
+// Treasury — same EOA on every EVM chain (EVM addresses derive from public
+// keys, so a single private key gives the same address everywhere). EIP-7702
+// delegations are per-chain and don't change the underlying account.
+const TREASURY_EOA: Address = "0x847F640bE052b0700C31F72Dce622F4C6286934E";
+
+const ETHEREUM_DEFAULT: ChainConfig = {
+  chainId: 1,
+  name: "Ethereum",
+  shortName: "Ethereum",
+  sablierLockup: "0x7C01AA3783577E15fD7e272443D44B92d5b21056",
+  usdc: "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
+  usdcDecimals: 6,
+  treasury: TREASURY_EOA,
+  explorerUrl: "https://etherscan.io",
+  explorerName: "Etherscan",
+  streamStartBlock: BigInt(21_717_452), // Sablier Lockup v2.0 deployment block
+  logChunkSize: BigInt(10_000),
+  isTestnet: false,
+};
+
 const BASE_DEFAULT: ChainConfig = {
   chainId: 8453,
   name: "Base",
@@ -23,22 +51,104 @@ const BASE_DEFAULT: ChainConfig = {
   sablierLockup: "0xb5D78DD3276325f5FAF3106Cc4Acc56E28e0Fe3B",
   usdc: "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
   usdcDecimals: 6,
-  treasury: "0x847F640bE052b0700C31F72Dce622F4C6286934E",
+  treasury: TREASURY_EOA,
   explorerUrl: "https://basescan.org",
+  explorerName: "BaseScan",
   streamStartBlock: BigInt(22_000_000),
   logChunkSize: BigInt(50_000),
   isTestnet: false,
 };
 
+const ARBITRUM_DEFAULT: ChainConfig = {
+  chainId: 42161,
+  name: "Arbitrum One",
+  shortName: "Arbitrum",
+  sablierLockup: "0x467D5Bf8Cfa1a5f99328fBdCb9C751c78934b725",
+  usdc: "0xaf88d065e77c8cC2239327C5EDb3A432268e5831", // native USDC, not USDC.e
+  usdcDecimals: 6,
+  treasury: TREASURY_EOA,
+  explorerUrl: "https://arbiscan.io",
+  explorerName: "Arbiscan",
+  streamStartBlock: BigInt(299_856_278),
+  logChunkSize: BigInt(10_000),
+  isTestnet: false,
+};
+
+const OPTIMISM_DEFAULT: ChainConfig = {
+  chainId: 10,
+  name: "Optimism",
+  shortName: "Optimism",
+  sablierLockup: "0x822e9c4852E978104d82F0f785bFA663c2b700c1",
+  usdc: "0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85", // native USDC
+  usdcDecimals: 6,
+  treasury: TREASURY_EOA,
+  explorerUrl: "https://optimistic.etherscan.io",
+  explorerName: "Optimistic Etherscan",
+  streamStartBlock: BigInt(131_196_856),
+  logChunkSize: BigInt(10_000),
+  isTestnet: false,
+};
+
+const POLYGON_DEFAULT: ChainConfig = {
+  chainId: 137,
+  name: "Polygon",
+  shortName: "Polygon",
+  sablierLockup: "0xE0BFe071Da104e571298f8b6e0fcE44C512C1Ff4",
+  usdc: "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359", // native USDC, not USDC.e
+  usdcDecimals: 6,
+  treasury: TREASURY_EOA,
+  explorerUrl: "https://polygonscan.com",
+  explorerName: "PolygonScan",
+  streamStartBlock: BigInt(67_212_728),
+  logChunkSize: BigInt(10_000),
+  isTestnet: false,
+};
+
+const AVALANCHE_DEFAULT: ChainConfig = {
+  chainId: 43114,
+  name: "Avalanche",
+  shortName: "Avalanche",
+  sablierLockup: "0x3C81BBBe72EF8eF3fb1D19B0bd6310Ad0dd27E82",
+  usdc: "0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E",
+  usdcDecimals: 6,
+  treasury: TREASURY_EOA,
+  explorerUrl: "https://snowtrace.io",
+  explorerName: "Snowtrace",
+  streamStartBlock: BigInt(56_433_739),
+  logChunkSize: BigInt(10_000),
+  isTestnet: false,
+};
+
+// BNB Smart Chain — note that "USDC" here is Binance-Peg (18 decimals, not 6).
+// Circle does not issue native USDC on BNB Chain. The token is custodied by
+// Binance and bridged. We support it for utility (casino degens cash out here)
+// but disclose the distinction in the UI via usdcNote.
+const BSC_DEFAULT: ChainConfig = {
+  chainId: 56,
+  name: "BNB Chain",
+  shortName: "BNB",
+  sablierLockup: "0x6E0baD2c077d699841F1929b45bfb93FAfBEd395",
+  usdc: "0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d", // Binance-Peg USDC
+  usdcDecimals: 18, // not 6 — sharp edge
+  treasury: TREASURY_EOA,
+  explorerUrl: "https://bscscan.com",
+  explorerName: "BscScan",
+  streamStartBlock: BigInt(46_137_048),
+  logChunkSize: BigInt(10_000),
+  isTestnet: false,
+  usdcNote: "On BNB Chain, USDC is Binance-Peg (custodied by Binance, 18 decimals).",
+};
+
 const BASE_SEPOLIA_DEFAULT: ChainConfig = {
   chainId: 84532,
   name: "Base Sepolia",
   shortName: "Base Sepolia",
-  sablierLockup: "0xa4777ca525d43a7af55d45b11b430606d7416f8d",
+  sablierLockup: "0xa4777CA525d43a7aF55D45b11b430606d7416f8d",
   usdc: "0x54C0f145D70ca4792e695697B6498552F1EC0009",
   usdcDecimals: 6,
   treasury: ZERO_ADDRESS,
   explorerUrl: "https://sepolia.basescan.org",
+  explorerName: "Base Sepolia BaseScan",
   streamStartBlock: BigInt(38_540_000),
   logChunkSize: BigInt(10_000),
   isTestnet: true,
@@ -62,7 +172,13 @@ function withEnvOverrides(cfg: ChainConfig): ChainConfig {
 }
 
 export const CHAINS: Record<number, ChainConfig> = {
+  [ETHEREUM_DEFAULT.chainId]: withEnvOverrides(ETHEREUM_DEFAULT),
   [BASE_DEFAULT.chainId]: withEnvOverrides(BASE_DEFAULT),
+  [ARBITRUM_DEFAULT.chainId]: withEnvOverrides(ARBITRUM_DEFAULT),
+  [OPTIMISM_DEFAULT.chainId]: withEnvOverrides(OPTIMISM_DEFAULT),
+  [POLYGON_DEFAULT.chainId]: withEnvOverrides(POLYGON_DEFAULT),
+  [AVALANCHE_DEFAULT.chainId]: withEnvOverrides(AVALANCHE_DEFAULT),
+  [BSC_DEFAULT.chainId]: withEnvOverrides(BSC_DEFAULT),
   [BASE_SEPOLIA_DEFAULT.chainId]: withEnvOverrides(BASE_SEPOLIA_DEFAULT),
 };
 
diff --git a/packages/app/src/config/wagmi.ts b/packages/app/src/config/wagmi.ts
index f5297e7..4292796 100644
--- a/packages/app/src/config/wagmi.ts
+++ b/packages/app/src/config/wagmi.ts
@@ -6,7 +6,13 @@ import { CHAINS } from "./chains";
 // Map a registry chainId to its wagmi chain definition. Add an entry here
 // when adding a chain to the registry so wagmi can pick it up.
 const chainIdToWagmiChain: Record<number, Chain> = {
+  [wagmiChains.mainnet.id]: wagmiChains.mainnet,
   [wagmiChains.base.id]: wagmiChains.base,
+  [wagmiChains.arbitrum.id]: wagmiChains.arbitrum,
+  [wagmiChains.optimism.id]: wagmiChains.optimism,
+  [wagmiChains.polygon.id]: wagmiChains.polygon,
+  [wagmiChains.avalanche.id]: wagmiChains.avalanche,
+  [wagmiChains.bsc.id]: wagmiChains.bsc,
   [wagmiChains.baseSepolia.id]: wagmiChains.baseSepolia,
 };